The early 3 series have been known to have a noisy fuel pump. As long as the car is operating fine it should not fail you. The pumps available today at the dealer have an updated design. Make sure you are using a reputable gas station. Gas with greater that 10% alcohol can make these pumps seize up.

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ok sensor I is located at the right of the top side oil filter, and sensor II is located to the very front right corner of the engine, they should just turn out like a bolt, diconnect the wires first of course and then tunr them out and replace then, make sure to put anti seize on the threads when installing new ones, reconnect wires and test again.